returing file as attachment js

submit = () => {
    let object = { ...this.props.values };
    let formData = new FormData();
    for (let property in object) {
      if (object.hasOwnProperty(property)) {
        formData.append(property, object[property]);
      }
    }
    fetch(`${process.env.REACT_APP_SIMCARDS_API}/simcard/neworder/order`, {
      method: "POST",
      mode: "cors",
      headers: {
        Authorization: getBearerAccessToken()
      },
      responseType: "blob",
      body: formData
    })
      .then(response => {
        if (response.ok) {
          return {
            name: response.headers.get("X-File-Name"),
            blob: response.blob()
          };
        } else {
          throw Error(`Request rejected with status ${response.status}`);
        }
      })
      .then(data => {
        return Promise.resolve(data);
      })
      .then(data => {
        return data.blob.then(blob => {
          if (window.navigator && window.navigator.msSaveOrOpenBlob) {
            window.navigator.msSaveOrOpenBlob(blob, data.name);
          } else {
            var url = window.URL.createObjectURL(blob);
            var a = document.createElement("a");
            a.href = url;
            a.download = data.name;
            document.body.appendChild(a);
            a.click();
            a.remove();
          }
        });
      })
};